Plumbing Contractor Permit Requirements in Hilo, HI

Complete permit and license guide for starting a plumbing contractor in Hilo, Hawaii County, Hawaii.

Updated 2026-03-15 5 stops $400–$1,200 est. 4–10 weeks to obtain all licenses
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Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.

Federal — start here

1 stop

  1. EIN (Employer Identification Number)

    Required if you have employees or operate as an LLC or corporation. Free from the IRS.

    Official government source

    FreeImmediate (online application)

State of Hawaii

1 stop

  1. Hawaii Department of Taxation — General Excise Tax License

    Hawaii does not have a traditional sales tax but requires all businesses to pay a General Excise Tax (GET) on gross income from business activities. The GET rate is 4% (4.5% in Honolulu). All businesses must register for a GET license with the Hawaii Department of Taxation.

    Official government source

    $20 (one-time registration fee)2–4 weeks (by mail) or immediate (in-person)

City of Hilo / Hawaii County

3 stops

  1. Hawaii Board of Plumbing — Plumbing Contractor License

    Plumbing contractors in Hawaii must hold a C-42 Plumbing Contractor License from the Hawaii Contractors License Board. Requires a Master Plumber and passing a state exam.

    Official government source

    $250–$400 (initial)4–8 weeks

  2. County of Hawaii Finance Department — Business License

    Hilo (Hawaii County) requires a County business registration and applicable permits. Contact the County Finance Department for business license requirements. This license must be renewed annually and displayed at your place of business.

    Official government source

    $50–$500/year depending on business type and gross revenues1–3 weeks

  3. Hawaii County / Hilo Plumbing Permit (per project)

    A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.

    Official government source

    $50–$300 per project1–5 business days

Terminus

Open for business — est. $400–$1,200 · 4–10 weeks to obtain all licenses

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Official Sources

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